Dynamic information storage or retrieval – Specific detail of information handling portion of system – Radiation beam modification of or by storage medium
Patent
1998-01-20
2000-06-27
Edun, Muhammad
Dynamic information storage or retrieval
Specific detail of information handling portion of system
Radiation beam modification of or by storage medium
369110, 369 4914, G11B 700
Patent
active
060814977
ABSTRACT:
An optical pickup is used for two kinds of disks, each of which uses a different wavelength of light. The optical pickup includes first and second light sources for individually emitting first and second light beams which have a respectively different wavelength from each other and are identically linearly polarized, a polarizing beam splitter, a quarter-wave plate and a total reflection element. The polarizing beam splitter, the quarterwave plate and the total reflection element are arranged so that a first optical path is formed in which the first light beam emitted from the first light source proceeds toward the loaded disk via the polarizing beam splitter and the objective lens and the first light beam reflected from the loaded disk proceeds toward the first light source via the objective lens and the polarizing beam splitter, and so that a second optical path is formed in which the second light beam emitted from the second light source proceeds toward the loaded disk via the polarizing beam splitter, the quarter-wave plate, the total reflection element, the quarter-wave plate, the polarizing beam splitter and the objective lens and the second light beam reflected from the loaded disk proceeds toward the second light source via the objective lens, the polarizing beam splitter, the quarter-wave plate, the total reflection element, the quarter-wave plate and the polarizing beam splitter. Thus, the optical pickup can be made compact and at a low cost. Also, the polarizing beam splitter, the quarter-wave plate and the total reflection element have respectively high light utilization efficiencies, which are appropriate for a recording and reproducing optical pickup.
REFERENCES:
patent: 5671206 (1997-09-01), Choi
Edun Muhammad
Samsung Electronics Co,. Ltd.
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